1393230989 has 2 divisors, whose sum is σ = 1393230990. Its totient is φ = 1393230988.

The previous prime is 1393230977. The next prime is 1393230991. The reversal of 1393230989 is 9890323931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 971257225 + 421973764 = 31165^2 + 20542^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1393230989 is a prime.

Together with 1393230991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1393230919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696615494 + 696615495.

It is an arithmetic number, because the mean of its divisors is an integer number (696615495).

Almost surely, 2^1393230989 is an apocalyptic number.

It is an amenable number.

1393230989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1393230989 is an equidigital number, since it uses as much as digits as its factorization.

1393230989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 1393230989 is about 37326.0095509820. The cubic root of 1393230989 is about 1116.8830718729.

The spelling of 1393230989 in words is "one billion, three hundred ninety-three million, two hundred thirty thousand, nine hundred eighty-nine".